| 1 | /* Darwin support for GDB, the GNU debugger. |
| 2 | Copyright (C) 2008-2013 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by AdaCore. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "symtab.h" |
| 24 | #include "gdbtypes.h" |
| 25 | #include "bfd.h" |
| 26 | #include "symfile.h" |
| 27 | #include "objfiles.h" |
| 28 | #include "buildsym.h" |
| 29 | #include "gdbcmd.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "mach-o.h" |
| 32 | #include "gdb_assert.h" |
| 33 | #include "aout/stab_gnu.h" |
| 34 | #include "vec.h" |
| 35 | #include "psympriv.h" |
| 36 | #include "complaints.h" |
| 37 | #include "gdb_bfd.h" |
| 38 | |
| 39 | #include <string.h> |
| 40 | |
| 41 | /* If non-zero displays debugging message. */ |
| 42 | static unsigned int mach_o_debug_level = 0; |
| 43 | |
| 44 | /* Dwarf debugging information are never in the final executable. They stay |
| 45 | in object files and the executable contains the list of object files read |
| 46 | during the link. |
| 47 | Each time an oso (other source) is found in the executable, the reader |
| 48 | creates such a structure. They are read after the processing of the |
| 49 | executable. */ |
| 50 | |
| 51 | typedef struct oso_el |
| 52 | { |
| 53 | /* Object file name. Can also be a member name. */ |
| 54 | const char *name; |
| 55 | |
| 56 | /* Associated time stamp. */ |
| 57 | unsigned long mtime; |
| 58 | |
| 59 | /* Stab symbols range for this OSO. */ |
| 60 | asymbol **oso_sym; |
| 61 | asymbol **end_sym; |
| 62 | |
| 63 | /* Number of interesting stabs in the range. */ |
| 64 | unsigned int nbr_syms; |
| 65 | } |
| 66 | oso_el; |
| 67 | |
| 68 | /* Vector of object files to be read after the executable. This is one |
| 69 | global variable but it's life-time is the one of macho_symfile_read. */ |
| 70 | DEF_VEC_O (oso_el); |
| 71 | static VEC (oso_el) *oso_vector; |
| 72 | |
| 73 | static void |
| 74 | macho_new_init (struct objfile *objfile) |
| 75 | { |
| 76 | } |
| 77 | |
| 78 | static void |
| 79 | macho_symfile_init (struct objfile *objfile) |
| 80 | { |
| 81 | objfile->flags |= OBJF_REORDERED; |
| 82 | } |
| 83 | |
| 84 | /* Add a new OSO to the vector of OSO to load. */ |
| 85 | |
| 86 | static void |
| 87 | macho_register_oso (struct objfile *objfile, |
| 88 | asymbol **oso_sym, asymbol **end_sym, |
| 89 | unsigned int nbr_syms) |
| 90 | { |
| 91 | oso_el el; |
| 92 | |
| 93 | el.name = (*oso_sym)->name; |
| 94 | el.mtime = (*oso_sym)->value; |
| 95 | el.oso_sym = oso_sym; |
| 96 | el.end_sym = end_sym; |
| 97 | el.nbr_syms = nbr_syms; |
| 98 | VEC_safe_push (oso_el, oso_vector, &el); |
| 99 | } |
| 100 | |
| 101 | /* Add symbol SYM to the minimal symbol table of OBJFILE. */ |
| 102 | |
| 103 | static void |
| 104 | macho_symtab_add_minsym (struct objfile *objfile, const asymbol *sym) |
| 105 | { |
| 106 | if (sym->name == NULL || *sym->name == '\0') |
| 107 | { |
| 108 | /* Skip names that don't exist (shouldn't happen), or names |
| 109 | that are null strings (may happen). */ |
| 110 | return; |
| 111 | } |
| 112 | |
| 113 | if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) |
| 114 | { |
| 115 | CORE_ADDR symaddr; |
| 116 | CORE_ADDR offset; |
| 117 | enum minimal_symbol_type ms_type; |
| 118 | |
| 119 | offset = ANOFFSET (objfile->section_offsets, |
| 120 | gdb_bfd_section_index (objfile->obfd, sym->section)); |
| 121 | |
| 122 | /* Bfd symbols are section relative. */ |
| 123 | symaddr = sym->value + sym->section->vma; |
| 124 | |
| 125 | /* Select global/local/weak symbols. Note that bfd puts abs |
| 126 | symbols in their own section, so all symbols we are |
| 127 | interested in will have a section. */ |
| 128 | /* Relocate all non-absolute and non-TLS symbols by the |
| 129 | section offset. */ |
| 130 | if (sym->section != bfd_abs_section_ptr |
| 131 | && !(sym->section->flags & SEC_THREAD_LOCAL)) |
| 132 | symaddr += offset; |
| 133 | |
| 134 | if (sym->section == bfd_abs_section_ptr) |
| 135 | ms_type = mst_abs; |
| 136 | else if (sym->section->flags & SEC_CODE) |
| 137 | { |
| 138 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
| 139 | ms_type = mst_text; |
| 140 | else |
| 141 | ms_type = mst_file_text; |
| 142 | } |
| 143 | else if (sym->section->flags & SEC_ALLOC) |
| 144 | { |
| 145 | if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
| 146 | { |
| 147 | if (sym->section->flags & SEC_LOAD) |
| 148 | ms_type = mst_data; |
| 149 | else |
| 150 | ms_type = mst_bss; |
| 151 | } |
| 152 | else if (sym->flags & BSF_LOCAL) |
| 153 | { |
| 154 | /* Not a special stabs-in-elf symbol, do regular |
| 155 | symbol processing. */ |
| 156 | if (sym->section->flags & SEC_LOAD) |
| 157 | ms_type = mst_file_data; |
| 158 | else |
| 159 | ms_type = mst_file_bss; |
| 160 | } |
| 161 | else |
| 162 | ms_type = mst_unknown; |
| 163 | } |
| 164 | else |
| 165 | return; /* Skip this symbol. */ |
| 166 | |
| 167 | prim_record_minimal_symbol_and_info |
| 168 | (sym->name, symaddr, ms_type, |
| 169 | gdb_bfd_section_index (objfile->obfd, sym->section), |
| 170 | objfile); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | /* Build the minimal symbol table from SYMBOL_TABLE of length |
| 175 | NUMBER_OF_SYMBOLS for OBJFILE. Registers OSO filenames found. */ |
| 176 | |
| 177 | static void |
| 178 | macho_symtab_read (struct objfile *objfile, |
| 179 | long number_of_symbols, asymbol **symbol_table) |
| 180 | { |
| 181 | long i; |
| 182 | const asymbol *dir_so = NULL; |
| 183 | const asymbol *file_so = NULL; |
| 184 | asymbol **oso_file = NULL; |
| 185 | unsigned int nbr_syms = 0; |
| 186 | |
| 187 | /* Current state while reading stabs. */ |
| 188 | enum |
| 189 | { |
| 190 | /* Not within an SO part. Only non-debugging symbols should be present, |
| 191 | and will be added to the minimal symbols table. */ |
| 192 | S_NO_SO, |
| 193 | |
| 194 | /* First SO read. Introduce an SO section, and may be followed by a second |
| 195 | SO. The SO section should contain onl debugging symbols. */ |
| 196 | S_FIRST_SO, |
| 197 | |
| 198 | /* Second non-null SO found, just after the first one. Means that the first |
| 199 | is in fact a directory name. */ |
| 200 | S_SECOND_SO, |
| 201 | |
| 202 | /* Non-null OSO found. Debugging info are DWARF in this OSO file. */ |
| 203 | S_DWARF_FILE, |
| 204 | |
| 205 | S_STAB_FILE |
| 206 | } state = S_NO_SO; |
| 207 | |
| 208 | for (i = 0; i < number_of_symbols; i++) |
| 209 | { |
| 210 | const asymbol *sym = symbol_table[i]; |
| 211 | bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym; |
| 212 | |
| 213 | switch (state) |
| 214 | { |
| 215 | case S_NO_SO: |
| 216 | if (mach_o_sym->n_type == N_SO) |
| 217 | { |
| 218 | /* Start of object stab. */ |
| 219 | if (sym->name == NULL || sym->name[0] == 0) |
| 220 | { |
| 221 | /* Unexpected empty N_SO. */ |
| 222 | complaint (&symfile_complaints, |
| 223 | _("Unexpected empty N_SO stab")); |
| 224 | } |
| 225 | else |
| 226 | { |
| 227 | file_so = sym; |
| 228 | dir_so = NULL; |
| 229 | state = S_FIRST_SO; |
| 230 | } |
| 231 | } |
| 232 | else if (sym->flags & BSF_DEBUGGING) |
| 233 | { |
| 234 | if (mach_o_sym->n_type == N_OPT) |
| 235 | { |
| 236 | /* No complaint for OPT. */ |
| 237 | break; |
| 238 | } |
| 239 | |
| 240 | /* Debugging symbols are not expected here. */ |
| 241 | complaint (&symfile_complaints, |
| 242 | _("%s: Unexpected debug stab outside SO markers"), |
| 243 | objfile->name); |
| 244 | } |
| 245 | else |
| 246 | { |
| 247 | /* Non-debugging symbols go to the minimal symbol table. */ |
| 248 | macho_symtab_add_minsym (objfile, sym); |
| 249 | } |
| 250 | break; |
| 251 | |
| 252 | case S_FIRST_SO: |
| 253 | case S_SECOND_SO: |
| 254 | if (mach_o_sym->n_type == N_SO) |
| 255 | { |
| 256 | if (sym->name == NULL || sym->name[0] == 0) |
| 257 | { |
| 258 | /* Unexpected empty N_SO. */ |
| 259 | complaint (&symfile_complaints, _("Empty SO section")); |
| 260 | state = S_NO_SO; |
| 261 | } |
| 262 | else if (state == S_FIRST_SO) |
| 263 | { |
| 264 | /* Second SO stab for the file name. */ |
| 265 | dir_so = file_so; |
| 266 | file_so = sym; |
| 267 | state = S_SECOND_SO; |
| 268 | } |
| 269 | else |
| 270 | complaint (&symfile_complaints, _("Three SO in a raw")); |
| 271 | } |
| 272 | else if (mach_o_sym->n_type == N_OSO) |
| 273 | { |
| 274 | if (sym->name == NULL || sym->name[0] == 0) |
| 275 | { |
| 276 | /* Empty OSO. Means that this file was compiled with |
| 277 | stabs. */ |
| 278 | state = S_STAB_FILE; |
| 279 | warning (_("stabs debugging not supported for %s"), |
| 280 | file_so->name); |
| 281 | } |
| 282 | else |
| 283 | { |
| 284 | /* Non-empty OSO for a Dwarf file. */ |
| 285 | oso_file = symbol_table + i; |
| 286 | nbr_syms = 0; |
| 287 | state = S_DWARF_FILE; |
| 288 | } |
| 289 | } |
| 290 | else |
| 291 | complaint (&symfile_complaints, |
| 292 | _("Unexpected stab after SO")); |
| 293 | break; |
| 294 | |
| 295 | case S_STAB_FILE: |
| 296 | case S_DWARF_FILE: |
| 297 | if (mach_o_sym->n_type == N_SO) |
| 298 | { |
| 299 | if (sym->name == NULL || sym->name[0] == 0) |
| 300 | { |
| 301 | /* End of file. */ |
| 302 | if (state == S_DWARF_FILE) |
| 303 | macho_register_oso (objfile, oso_file, symbol_table + i, |
| 304 | nbr_syms); |
| 305 | state = S_NO_SO; |
| 306 | } |
| 307 | else |
| 308 | { |
| 309 | complaint (&symfile_complaints, _("Missing nul SO")); |
| 310 | file_so = sym; |
| 311 | dir_so = NULL; |
| 312 | state = S_FIRST_SO; |
| 313 | } |
| 314 | } |
| 315 | else if (sym->flags & BSF_DEBUGGING) |
| 316 | { |
| 317 | if (state == S_STAB_FILE) |
| 318 | { |
| 319 | /* FIXME: to be implemented. */ |
| 320 | } |
| 321 | else |
| 322 | { |
| 323 | switch (mach_o_sym->n_type) |
| 324 | { |
| 325 | case N_FUN: |
| 326 | if (sym->name == NULL || sym->name[0] == 0) |
| 327 | break; |
| 328 | /* Fall through. */ |
| 329 | case N_STSYM: |
| 330 | /* Interesting symbol. */ |
| 331 | nbr_syms++; |
| 332 | break; |
| 333 | case N_ENSYM: |
| 334 | case N_BNSYM: |
| 335 | case N_GSYM: |
| 336 | break; |
| 337 | default: |
| 338 | complaint (&symfile_complaints, |
| 339 | _("unhandled stab for dwarf OSO file")); |
| 340 | break; |
| 341 | } |
| 342 | } |
| 343 | } |
| 344 | else |
| 345 | complaint (&symfile_complaints, |
| 346 | _("non-debugging symbol within SO")); |
| 347 | break; |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | if (state != S_NO_SO) |
| 352 | complaint (&symfile_complaints, _("missing nul SO")); |
| 353 | } |
| 354 | |
| 355 | /* If NAME describes an archive member (ie: ARCHIVE '(' MEMBER ')'), |
| 356 | returns the length of the archive name. |
| 357 | Returns -1 otherwise. */ |
| 358 | |
| 359 | static int |
| 360 | get_archive_prefix_len (const char *name) |
| 361 | { |
| 362 | char *lparen; |
| 363 | int name_len = strlen (name); |
| 364 | |
| 365 | if (name_len == 0 || name[name_len - 1] != ')') |
| 366 | return -1; |
| 367 | |
| 368 | lparen = strrchr (name, '('); |
| 369 | if (lparen == NULL || lparen == name) |
| 370 | return -1; |
| 371 | return lparen - name; |
| 372 | } |
| 373 | |
| 374 | /* Compare function to qsort OSOs, so that members of a library are |
| 375 | gathered. */ |
| 376 | |
| 377 | static int |
| 378 | oso_el_compare_name (const void *vl, const void *vr) |
| 379 | { |
| 380 | const oso_el *l = (const oso_el *)vl; |
| 381 | const oso_el *r = (const oso_el *)vr; |
| 382 | |
| 383 | return strcmp (l->name, r->name); |
| 384 | } |
| 385 | |
| 386 | /* Hash table entry structure for the stabs symbols in the main object file. |
| 387 | This is used to speed up lookup for symbols in the OSO. */ |
| 388 | |
| 389 | struct macho_sym_hash_entry |
| 390 | { |
| 391 | struct bfd_hash_entry base; |
| 392 | const asymbol *sym; |
| 393 | }; |
| 394 | |
| 395 | /* Routine to create an entry in the hash table. */ |
| 396 | |
| 397 | static struct bfd_hash_entry * |
| 398 | macho_sym_hash_newfunc (struct bfd_hash_entry *entry, |
| 399 | struct bfd_hash_table *table, |
| 400 | const char *string) |
| 401 | { |
| 402 | struct macho_sym_hash_entry *ret = (struct macho_sym_hash_entry *) entry; |
| 403 | |
| 404 | /* Allocate the structure if it has not already been allocated by a |
| 405 | subclass. */ |
| 406 | if (ret == NULL) |
| 407 | ret = (struct macho_sym_hash_entry *) bfd_hash_allocate (table, |
| 408 | sizeof (* ret)); |
| 409 | if (ret == NULL) |
| 410 | return NULL; |
| 411 | |
| 412 | /* Call the allocation method of the superclass. */ |
| 413 | ret = (struct macho_sym_hash_entry *) |
| 414 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string); |
| 415 | |
| 416 | if (ret) |
| 417 | { |
| 418 | /* Initialize the local fields. */ |
| 419 | ret->sym = NULL; |
| 420 | } |
| 421 | |
| 422 | return (struct bfd_hash_entry *) ret; |
| 423 | } |
| 424 | |
| 425 | /* Get the value of SYM from the minimal symtab of MAIN_OBJFILE. This is used |
| 426 | to get the value of global and common symbols. */ |
| 427 | |
| 428 | static CORE_ADDR |
| 429 | macho_resolve_oso_sym_with_minsym (struct objfile *main_objfile, asymbol *sym) |
| 430 | { |
| 431 | /* For common symbol and global symbols, use the min symtab. */ |
| 432 | struct minimal_symbol *msym; |
| 433 | const char *name = sym->name; |
| 434 | |
| 435 | if (name[0] == bfd_get_symbol_leading_char (main_objfile->obfd)) |
| 436 | ++name; |
| 437 | msym = lookup_minimal_symbol (name, NULL, main_objfile); |
| 438 | if (msym == NULL) |
| 439 | { |
| 440 | warning (_("can't find symbol '%s' in minsymtab"), name); |
| 441 | return 0; |
| 442 | } |
| 443 | else |
| 444 | return SYMBOL_VALUE_ADDRESS (msym); |
| 445 | } |
| 446 | |
| 447 | /* Add oso file OSO/ABFD as a symbol file. */ |
| 448 | |
| 449 | static void |
| 450 | macho_add_oso_symfile (oso_el *oso, bfd *abfd, |
| 451 | struct objfile *main_objfile, int symfile_flags) |
| 452 | { |
| 453 | int storage; |
| 454 | int i; |
| 455 | asymbol **symbol_table; |
| 456 | asymbol **symp; |
| 457 | struct bfd_hash_table table; |
| 458 | int nbr_sections; |
| 459 | struct cleanup *cleanup; |
| 460 | |
| 461 | /* Per section flag to mark which section have been rebased. */ |
| 462 | unsigned char *sections_rebased; |
| 463 | |
| 464 | if (mach_o_debug_level > 0) |
| 465 | printf_unfiltered |
| 466 | (_("Loading debugging symbols from oso: %s\n"), oso->name); |
| 467 | |
| 468 | if (!bfd_check_format (abfd, bfd_object)) |
| 469 | { |
| 470 | warning (_("`%s': can't read symbols: %s."), oso->name, |
| 471 | bfd_errmsg (bfd_get_error ())); |
| 472 | gdb_bfd_unref (abfd); |
| 473 | return; |
| 474 | } |
| 475 | |
| 476 | if (abfd->my_archive == NULL && oso->mtime != bfd_get_mtime (abfd)) |
| 477 | { |
| 478 | warning (_("`%s': file time stamp mismatch."), oso->name); |
| 479 | gdb_bfd_unref (abfd); |
| 480 | return; |
| 481 | } |
| 482 | |
| 483 | if (!bfd_hash_table_init_n (&table, macho_sym_hash_newfunc, |
| 484 | sizeof (struct macho_sym_hash_entry), |
| 485 | oso->nbr_syms)) |
| 486 | { |
| 487 | warning (_("`%s': can't create hash table"), oso->name); |
| 488 | gdb_bfd_unref (abfd); |
| 489 | return; |
| 490 | } |
| 491 | |
| 492 | bfd_set_cacheable (abfd, 1); |
| 493 | |
| 494 | /* Read symbols table. */ |
| 495 | storage = bfd_get_symtab_upper_bound (abfd); |
| 496 | symbol_table = (asymbol **) xmalloc (storage); |
| 497 | bfd_canonicalize_symtab (abfd, symbol_table); |
| 498 | |
| 499 | /* Init section flags. */ |
| 500 | nbr_sections = bfd_count_sections (abfd); |
| 501 | sections_rebased = (unsigned char *) alloca (nbr_sections); |
| 502 | for (i = 0; i < nbr_sections; i++) |
| 503 | sections_rebased[i] = 0; |
| 504 | |
| 505 | /* Put symbols for the OSO file in the hash table. */ |
| 506 | for (symp = oso->oso_sym; symp != oso->end_sym; symp++) |
| 507 | { |
| 508 | const asymbol *sym = *symp; |
| 509 | bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym; |
| 510 | |
| 511 | switch (mach_o_sym->n_type) |
| 512 | { |
| 513 | case N_ENSYM: |
| 514 | case N_BNSYM: |
| 515 | case N_GSYM: |
| 516 | sym = NULL; |
| 517 | break; |
| 518 | case N_FUN: |
| 519 | if (sym->name == NULL || sym->name[0] == 0) |
| 520 | sym = NULL; |
| 521 | break; |
| 522 | case N_STSYM: |
| 523 | break; |
| 524 | default: |
| 525 | sym = NULL; |
| 526 | break; |
| 527 | } |
| 528 | if (sym != NULL) |
| 529 | { |
| 530 | struct macho_sym_hash_entry *ent; |
| 531 | |
| 532 | ent = (struct macho_sym_hash_entry *) |
| 533 | bfd_hash_lookup (&table, sym->name, TRUE, FALSE); |
| 534 | if (ent->sym != NULL) |
| 535 | complaint (&symfile_complaints, |
| 536 | _("Duplicated symbol %s in symbol table"), sym->name); |
| 537 | else |
| 538 | { |
| 539 | if (mach_o_debug_level > 4) |
| 540 | { |
| 541 | struct gdbarch *arch = get_objfile_arch (main_objfile); |
| 542 | printf_unfiltered |
| 543 | (_("Adding symbol %s (addr: %s)\n"), |
| 544 | sym->name, paddress (arch, sym->value)); |
| 545 | } |
| 546 | ent->sym = sym; |
| 547 | } |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | /* Relocate symbols of the OSO. */ |
| 552 | for (i = 0; symbol_table[i]; i++) |
| 553 | { |
| 554 | asymbol *sym = symbol_table[i]; |
| 555 | bfd_mach_o_asymbol *mach_o_sym = (bfd_mach_o_asymbol *)sym; |
| 556 | |
| 557 | if (mach_o_sym->n_type & BFD_MACH_O_N_STAB) |
| 558 | continue; |
| 559 | if ((mach_o_sym->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_UNDF |
| 560 | && sym->value != 0) |
| 561 | { |
| 562 | /* For common symbol use the min symtab and modify the OSO |
| 563 | symbol table. */ |
| 564 | CORE_ADDR res; |
| 565 | |
| 566 | res = macho_resolve_oso_sym_with_minsym (main_objfile, sym); |
| 567 | if (res != 0) |
| 568 | { |
| 569 | sym->section = bfd_com_section_ptr; |
| 570 | sym->value = res; |
| 571 | } |
| 572 | } |
| 573 | else if ((mach_o_sym->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_SECT) |
| 574 | { |
| 575 | /* Normal symbol. */ |
| 576 | asection *sec = sym->section; |
| 577 | bfd_mach_o_section *msec; |
| 578 | unsigned int sec_type; |
| 579 | |
| 580 | /* Skip buggy ones. */ |
| 581 | if (sec == NULL || sections_rebased[sec->index] != 0) |
| 582 | continue; |
| 583 | |
| 584 | /* Only consider regular, non-debugging sections. */ |
| 585 | msec = bfd_mach_o_get_mach_o_section (sec); |
| 586 | sec_type = msec->flags & BFD_MACH_O_SECTION_TYPE_MASK; |
| 587 | if ((sec_type == BFD_MACH_O_S_REGULAR |
| 588 | || sec_type == BFD_MACH_O_S_ZEROFILL) |
| 589 | && (msec->flags & BFD_MACH_O_S_ATTR_DEBUG) == 0) |
| 590 | { |
| 591 | CORE_ADDR addr = 0; |
| 592 | |
| 593 | if ((mach_o_sym->n_type & BFD_MACH_O_N_EXT) != 0) |
| 594 | { |
| 595 | /* Use the min symtab for global symbols. */ |
| 596 | addr = macho_resolve_oso_sym_with_minsym (main_objfile, sym); |
| 597 | } |
| 598 | else |
| 599 | { |
| 600 | struct macho_sym_hash_entry *ent; |
| 601 | |
| 602 | ent = (struct macho_sym_hash_entry *) |
| 603 | bfd_hash_lookup (&table, sym->name, FALSE, FALSE); |
| 604 | if (ent != NULL) |
| 605 | addr = bfd_asymbol_value (ent->sym); |
| 606 | } |
| 607 | |
| 608 | /* Adjust the section. */ |
| 609 | if (addr != 0) |
| 610 | { |
| 611 | CORE_ADDR res = addr - sym->value; |
| 612 | |
| 613 | if (mach_o_debug_level > 3) |
| 614 | { |
| 615 | struct gdbarch *arch = get_objfile_arch (main_objfile); |
| 616 | printf_unfiltered |
| 617 | (_("resolve sect %s with %s (set to %s)\n"), |
| 618 | sec->name, sym->name, |
| 619 | paddress (arch, res)); |
| 620 | } |
| 621 | bfd_set_section_vma (abfd, sec, res); |
| 622 | sections_rebased[sec->index] = 1; |
| 623 | } |
| 624 | } |
| 625 | else |
| 626 | { |
| 627 | /* Mark the section as never rebased. */ |
| 628 | sections_rebased[sec->index] = 2; |
| 629 | } |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | bfd_hash_table_free (&table); |
| 634 | |
| 635 | /* We need to clear SYMFILE_MAINLINE to avoid interractive question |
| 636 | from symfile.c:symbol_file_add_with_addrs_or_offsets. */ |
| 637 | cleanup = make_cleanup_bfd_unref (abfd); |
| 638 | symbol_file_add_from_bfd |
| 639 | (abfd, symfile_flags & ~(SYMFILE_MAINLINE | SYMFILE_VERBOSE), NULL, |
| 640 | main_objfile->flags & (OBJF_REORDERED | OBJF_SHARED |
| 641 | | OBJF_READNOW | OBJF_USERLOADED), |
| 642 | main_objfile); |
| 643 | do_cleanups (cleanup); |
| 644 | } |
| 645 | |
| 646 | /* Read symbols from the vector of oso files. */ |
| 647 | |
| 648 | static void |
| 649 | macho_symfile_read_all_oso (struct objfile *main_objfile, int symfile_flags) |
| 650 | { |
| 651 | int ix; |
| 652 | VEC (oso_el) *vec; |
| 653 | oso_el *oso; |
| 654 | struct cleanup *cleanup = make_cleanup (null_cleanup, NULL); |
| 655 | |
| 656 | vec = oso_vector; |
| 657 | oso_vector = NULL; |
| 658 | |
| 659 | /* Sort oso by name so that files from libraries are gathered. */ |
| 660 | qsort (VEC_address (oso_el, vec), VEC_length (oso_el, vec), |
| 661 | sizeof (oso_el), oso_el_compare_name); |
| 662 | |
| 663 | for (ix = 0; VEC_iterate (oso_el, vec, ix, oso);) |
| 664 | { |
| 665 | int pfx_len; |
| 666 | |
| 667 | /* Check if this is a library name. */ |
| 668 | pfx_len = get_archive_prefix_len (oso->name); |
| 669 | if (pfx_len > 0) |
| 670 | { |
| 671 | bfd *archive_bfd; |
| 672 | bfd *member_bfd; |
| 673 | char *archive_name = XNEWVEC (char, pfx_len + 1); |
| 674 | int last_ix; |
| 675 | oso_el *oso2; |
| 676 | int ix2; |
| 677 | |
| 678 | memcpy (archive_name, oso->name, pfx_len); |
| 679 | archive_name[pfx_len] = '\0'; |
| 680 | |
| 681 | make_cleanup (xfree, archive_name); |
| 682 | |
| 683 | /* Compute number of oso for this archive. */ |
| 684 | for (last_ix = ix; |
| 685 | VEC_iterate (oso_el, vec, last_ix, oso2); last_ix++) |
| 686 | { |
| 687 | if (strncmp (oso2->name, archive_name, pfx_len) != 0) |
| 688 | break; |
| 689 | } |
| 690 | |
| 691 | /* Open the archive and check the format. */ |
| 692 | archive_bfd = gdb_bfd_open (archive_name, gnutarget, -1); |
| 693 | if (archive_bfd == NULL) |
| 694 | { |
| 695 | warning (_("Could not open OSO archive file \"%s\""), |
| 696 | archive_name); |
| 697 | ix = last_ix; |
| 698 | continue; |
| 699 | } |
| 700 | if (!bfd_check_format (archive_bfd, bfd_archive)) |
| 701 | { |
| 702 | warning (_("OSO archive file \"%s\" not an archive."), |
| 703 | archive_name); |
| 704 | gdb_bfd_unref (archive_bfd); |
| 705 | ix = last_ix; |
| 706 | continue; |
| 707 | } |
| 708 | |
| 709 | member_bfd = gdb_bfd_openr_next_archived_file (archive_bfd, NULL); |
| 710 | |
| 711 | if (member_bfd == NULL) |
| 712 | { |
| 713 | warning (_("Could not read archive members out of " |
| 714 | "OSO archive \"%s\""), archive_name); |
| 715 | gdb_bfd_unref (archive_bfd); |
| 716 | ix = last_ix; |
| 717 | continue; |
| 718 | } |
| 719 | |
| 720 | /* Load all oso in this library. */ |
| 721 | while (member_bfd != NULL) |
| 722 | { |
| 723 | bfd *prev; |
| 724 | const char *member_name = member_bfd->filename; |
| 725 | int member_len = strlen (member_name); |
| 726 | |
| 727 | /* If this member is referenced, add it as a symfile. */ |
| 728 | for (ix2 = ix; ix2 < last_ix; ix2++) |
| 729 | { |
| 730 | oso2 = VEC_index (oso_el, vec, ix2); |
| 731 | |
| 732 | if (oso2->name |
| 733 | && strlen (oso2->name) == pfx_len + member_len + 2 |
| 734 | && !memcmp (member_name, oso2->name + pfx_len + 1, |
| 735 | member_len)) |
| 736 | { |
| 737 | macho_add_oso_symfile (oso2, member_bfd, |
| 738 | main_objfile, symfile_flags); |
| 739 | oso2->name = NULL; |
| 740 | break; |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | prev = member_bfd; |
| 745 | member_bfd = gdb_bfd_openr_next_archived_file (archive_bfd, |
| 746 | member_bfd); |
| 747 | |
| 748 | /* Free previous member if not referenced by an oso. */ |
| 749 | if (ix2 >= last_ix) |
| 750 | gdb_bfd_unref (prev); |
| 751 | } |
| 752 | for (ix2 = ix; ix2 < last_ix; ix2++) |
| 753 | { |
| 754 | oso_el *oso2 = VEC_index (oso_el, vec, ix2); |
| 755 | |
| 756 | if (oso2->name != NULL) |
| 757 | warning (_("Could not find specified archive member " |
| 758 | "for OSO name \"%s\""), oso->name); |
| 759 | } |
| 760 | ix = last_ix; |
| 761 | } |
| 762 | else |
| 763 | { |
| 764 | bfd *abfd; |
| 765 | |
| 766 | abfd = gdb_bfd_open (oso->name, gnutarget, -1); |
| 767 | if (!abfd) |
| 768 | warning (_("`%s': can't open to read symbols: %s."), oso->name, |
| 769 | bfd_errmsg (bfd_get_error ())); |
| 770 | else |
| 771 | macho_add_oso_symfile (oso, abfd, main_objfile, symfile_flags); |
| 772 | |
| 773 | ix++; |
| 774 | } |
| 775 | } |
| 776 | |
| 777 | VEC_free (oso_el, vec); |
| 778 | do_cleanups (cleanup); |
| 779 | } |
| 780 | |
| 781 | /* DSYM (debug symbols) files contain the debug info of an executable. |
| 782 | This is a separate file created by dsymutil(1) and is similar to debug |
| 783 | link feature on ELF. |
| 784 | DSYM files are located in a subdirectory. Append DSYM_SUFFIX to the |
| 785 | executable name and the executable base name to get the DSYM file name. */ |
| 786 | #define DSYM_SUFFIX ".dSYM/Contents/Resources/DWARF/" |
| 787 | |
| 788 | /* Check if a dsym file exists for OBJFILE. If so, returns a bfd for it. |
| 789 | Return NULL if no valid dsym file is found. */ |
| 790 | |
| 791 | static bfd * |
| 792 | macho_check_dsym (struct objfile *objfile) |
| 793 | { |
| 794 | size_t name_len = strlen (objfile->name); |
| 795 | size_t dsym_len = strlen (DSYM_SUFFIX); |
| 796 | const char *base_name = lbasename (objfile->name); |
| 797 | size_t base_len = strlen (base_name); |
| 798 | char *dsym_filename = alloca (name_len + dsym_len + base_len + 1); |
| 799 | bfd *dsym_bfd; |
| 800 | bfd_mach_o_load_command *main_uuid; |
| 801 | bfd_mach_o_load_command *dsym_uuid; |
| 802 | |
| 803 | strcpy (dsym_filename, objfile->name); |
| 804 | strcpy (dsym_filename + name_len, DSYM_SUFFIX); |
| 805 | strcpy (dsym_filename + name_len + dsym_len, base_name); |
| 806 | |
| 807 | if (access (dsym_filename, R_OK) != 0) |
| 808 | return NULL; |
| 809 | |
| 810 | if (bfd_mach_o_lookup_command (objfile->obfd, |
| 811 | BFD_MACH_O_LC_UUID, &main_uuid) == 0) |
| 812 | { |
| 813 | warning (_("can't find UUID in %s"), objfile->name); |
| 814 | return NULL; |
| 815 | } |
| 816 | dsym_bfd = gdb_bfd_openr (dsym_filename, gnutarget); |
| 817 | if (dsym_bfd == NULL) |
| 818 | { |
| 819 | warning (_("can't open dsym file %s"), dsym_filename); |
| 820 | return NULL; |
| 821 | } |
| 822 | |
| 823 | if (!bfd_check_format (dsym_bfd, bfd_object)) |
| 824 | { |
| 825 | gdb_bfd_unref (dsym_bfd); |
| 826 | warning (_("bad dsym file format: %s"), bfd_errmsg (bfd_get_error ())); |
| 827 | return NULL; |
| 828 | } |
| 829 | |
| 830 | if (bfd_mach_o_lookup_command (dsym_bfd, |
| 831 | BFD_MACH_O_LC_UUID, &dsym_uuid) == 0) |
| 832 | { |
| 833 | warning (_("can't find UUID in %s"), dsym_filename); |
| 834 | gdb_bfd_unref (dsym_bfd); |
| 835 | return NULL; |
| 836 | } |
| 837 | if (memcmp (dsym_uuid->command.uuid.uuid, main_uuid->command.uuid.uuid, |
| 838 | sizeof (main_uuid->command.uuid.uuid))) |
| 839 | { |
| 840 | warning (_("dsym file UUID doesn't match the one in %s"), objfile->name); |
| 841 | gdb_bfd_unref (dsym_bfd); |
| 842 | return NULL; |
| 843 | } |
| 844 | return dsym_bfd; |
| 845 | } |
| 846 | |
| 847 | static void |
| 848 | macho_symfile_read (struct objfile *objfile, int symfile_flags) |
| 849 | { |
| 850 | bfd *abfd = objfile->obfd; |
| 851 | CORE_ADDR offset; |
| 852 | long storage_needed; |
| 853 | bfd *dsym_bfd; |
| 854 | |
| 855 | /* Get symbols from the symbol table only if the file is an executable. |
| 856 | The symbol table of object files is not relocated and is expected to |
| 857 | be in the executable. */ |
| 858 | if (bfd_get_file_flags (abfd) & (EXEC_P | DYNAMIC)) |
| 859 | { |
| 860 | /* Process the normal symbol table first. */ |
| 861 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
| 862 | if (storage_needed < 0) |
| 863 | error (_("Can't read symbols from %s: %s"), |
| 864 | bfd_get_filename (objfile->obfd), |
| 865 | bfd_errmsg (bfd_get_error ())); |
| 866 | |
| 867 | if (storage_needed > 0) |
| 868 | { |
| 869 | asymbol **symbol_table; |
| 870 | long symcount; |
| 871 | struct cleanup *back_to; |
| 872 | |
| 873 | symbol_table = (asymbol **) xmalloc (storage_needed); |
| 874 | make_cleanup (xfree, symbol_table); |
| 875 | |
| 876 | init_minimal_symbol_collection (); |
| 877 | back_to = make_cleanup_discard_minimal_symbols (); |
| 878 | |
| 879 | symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
| 880 | |
| 881 | if (symcount < 0) |
| 882 | error (_("Can't read symbols from %s: %s"), |
| 883 | bfd_get_filename (objfile->obfd), |
| 884 | bfd_errmsg (bfd_get_error ())); |
| 885 | |
| 886 | macho_symtab_read (objfile, symcount, symbol_table); |
| 887 | |
| 888 | install_minimal_symbols (objfile); |
| 889 | do_cleanups (back_to); |
| 890 | } |
| 891 | |
| 892 | /* Try to read .eh_frame / .debug_frame. */ |
| 893 | /* First, locate these sections. We ignore the result status |
| 894 | as it only checks for debug info. */ |
| 895 | dwarf2_has_info (objfile, NULL); |
| 896 | dwarf2_build_frame_info (objfile); |
| 897 | |
| 898 | /* Check for DSYM file. */ |
| 899 | dsym_bfd = macho_check_dsym (objfile); |
| 900 | if (dsym_bfd != NULL) |
| 901 | { |
| 902 | int ix; |
| 903 | oso_el *oso; |
| 904 | struct bfd_section *asect, *dsect; |
| 905 | struct cleanup *cleanup; |
| 906 | |
| 907 | if (mach_o_debug_level > 0) |
| 908 | printf_unfiltered (_("dsym file found\n")); |
| 909 | |
| 910 | /* Remove oso. They won't be used. */ |
| 911 | VEC_free (oso_el, oso_vector); |
| 912 | oso_vector = NULL; |
| 913 | |
| 914 | /* Set dsym section size. */ |
| 915 | for (asect = objfile->obfd->sections, dsect = dsym_bfd->sections; |
| 916 | asect && dsect; |
| 917 | asect = asect->next, dsect = dsect->next) |
| 918 | { |
| 919 | if (strcmp (asect->name, dsect->name) != 0) |
| 920 | break; |
| 921 | bfd_set_section_size (dsym_bfd, dsect, |
| 922 | bfd_get_section_size (asect)); |
| 923 | } |
| 924 | |
| 925 | /* Add the dsym file as a separate file. */ |
| 926 | cleanup = make_cleanup_bfd_unref (dsym_bfd); |
| 927 | symbol_file_add_separate (dsym_bfd, symfile_flags, objfile); |
| 928 | do_cleanups (cleanup); |
| 929 | |
| 930 | /* Don't try to read dwarf2 from main file or shared libraries. */ |
| 931 | return; |
| 932 | } |
| 933 | } |
| 934 | |
| 935 | if (dwarf2_has_info (objfile, NULL)) |
| 936 | { |
| 937 | /* DWARF 2 sections */ |
| 938 | dwarf2_build_psymtabs (objfile); |
| 939 | } |
| 940 | |
| 941 | /* Then the oso. */ |
| 942 | if (oso_vector != NULL) |
| 943 | macho_symfile_read_all_oso (objfile, symfile_flags); |
| 944 | } |
| 945 | |
| 946 | static bfd_byte * |
| 947 | macho_symfile_relocate (struct objfile *objfile, asection *sectp, |
| 948 | bfd_byte *buf) |
| 949 | { |
| 950 | bfd *abfd = objfile->obfd; |
| 951 | |
| 952 | /* We're only interested in sections with relocation |
| 953 | information. */ |
| 954 | if ((sectp->flags & SEC_RELOC) == 0) |
| 955 | return NULL; |
| 956 | |
| 957 | if (mach_o_debug_level > 0) |
| 958 | printf_unfiltered (_("Relocate section '%s' of %s\n"), |
| 959 | sectp->name, objfile->name); |
| 960 | |
| 961 | return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL); |
| 962 | } |
| 963 | |
| 964 | static void |
| 965 | macho_symfile_finish (struct objfile *objfile) |
| 966 | { |
| 967 | } |
| 968 | |
| 969 | static void |
| 970 | macho_symfile_offsets (struct objfile *objfile, |
| 971 | const struct section_addr_info *addrs) |
| 972 | { |
| 973 | unsigned int i; |
| 974 | unsigned int num_sections; |
| 975 | struct obj_section *osect; |
| 976 | |
| 977 | /* Allocate section_offsets. */ |
| 978 | objfile->num_sections = bfd_count_sections (objfile->obfd); |
| 979 | objfile->section_offsets = (struct section_offsets *) |
| 980 | obstack_alloc (&objfile->objfile_obstack, |
| 981 | SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
| 982 | memset (objfile->section_offsets, 0, |
| 983 | SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)); |
| 984 | |
| 985 | /* This code is run when we first add the objfile with |
| 986 | symfile_add_with_addrs_or_offsets, when "addrs" not "offsets" are |
| 987 | passed in. The place in symfile.c where the addrs are applied |
| 988 | depends on the addrs having section names. But in the dyld code |
| 989 | we build an anonymous array of addrs, so that code is a no-op. |
| 990 | Because of that, we have to apply the addrs to the sections here. |
| 991 | N.B. if an objfile slides after we've already created it, then it |
| 992 | goes through objfile_relocate. */ |
| 993 | |
| 994 | for (i = 0; i < addrs->num_sections; i++) |
| 995 | { |
| 996 | ALL_OBJFILE_OSECTIONS (objfile, osect) |
| 997 | { |
| 998 | const char *bfd_sect_name = osect->the_bfd_section->name; |
| 999 | |
| 1000 | if (strcmp (bfd_sect_name, addrs->other[i].name) == 0) |
| 1001 | { |
| 1002 | obj_section_offset (osect) = addrs->other[i].addr; |
| 1003 | break; |
| 1004 | } |
| 1005 | } |
| 1006 | } |
| 1007 | |
| 1008 | objfile->sect_index_text = 0; |
| 1009 | |
| 1010 | ALL_OBJFILE_OSECTIONS (objfile, osect) |
| 1011 | { |
| 1012 | const char *bfd_sect_name = osect->the_bfd_section->name; |
| 1013 | int sect_index = osect - objfile->sections;; |
| 1014 | |
| 1015 | if (strncmp (bfd_sect_name, "LC_SEGMENT.", 11) == 0) |
| 1016 | bfd_sect_name += 11; |
| 1017 | if (strcmp (bfd_sect_name, "__TEXT") == 0 |
| 1018 | || strcmp (bfd_sect_name, "__TEXT.__text") == 0) |
| 1019 | objfile->sect_index_text = sect_index; |
| 1020 | } |
| 1021 | } |
| 1022 | |
| 1023 | static const struct sym_fns macho_sym_fns = { |
| 1024 | bfd_target_mach_o_flavour, |
| 1025 | |
| 1026 | macho_new_init, /* init anything gbl to entire symtab */ |
| 1027 | macho_symfile_init, /* read initial info, setup for sym_read() */ |
| 1028 | macho_symfile_read, /* read a symbol file into symtab */ |
| 1029 | NULL, /* sym_read_psymbols */ |
| 1030 | macho_symfile_finish, /* finished with file, cleanup */ |
| 1031 | macho_symfile_offsets, /* xlate external to internal form */ |
| 1032 | default_symfile_segments, /* Get segment information from a file. */ |
| 1033 | NULL, |
| 1034 | macho_symfile_relocate, /* Relocate a debug section. */ |
| 1035 | NULL, /* sym_get_probes */ |
| 1036 | &psym_functions |
| 1037 | }; |
| 1038 | |
| 1039 | /* -Wmissing-prototypes */ |
| 1040 | extern initialize_file_ftype _initialize_machoread; |
| 1041 | |
| 1042 | void |
| 1043 | _initialize_machoread () |
| 1044 | { |
| 1045 | add_symtab_fns (&macho_sym_fns); |
| 1046 | |
| 1047 | add_setshow_zuinteger_cmd ("mach-o", class_obscure, |
| 1048 | &mach_o_debug_level, |
| 1049 | _("Set if printing Mach-O symbols processing."), |
| 1050 | _("Show if printing Mach-O symbols processing."), |
| 1051 | NULL, NULL, NULL, |
| 1052 | &setdebuglist, &showdebuglist); |
| 1053 | } |